对承压设备管子及压力管道环向对接接头射线检测时,为测定未焊透、根部内凹和根部内咬边的深度,JB/T4730.5-2005标准要求采用对比试块(Ⅱ型)或小径管专用对比试块(ⅠA型或ⅠB型)进行测定,根据测定的深度进行质量分级。但采用这种方法能否准确测定缺陷的深度,同时在实际工作中能否便利实施,本文对此展开讨论,并提出了建议。 JB / T4730.5-2005 standard requires the use of contrast test block (Ⅱ type) for the determination of the penetration depth of under-penetration, root recess and root under-pressure test when pressure-measuring equipment pipe and pressure pipe ring butt joint, Or small diameter tube special contrast test block (Ⅰ A type or Ⅰ B type) were measured, according to the determination of the depth of mass grading. However, this method can accurately determine the depth of defects, while in the practical work can facilitate the implementation of this article to discuss and put forward suggestions.